The most fun thing Leeza has in her inventory is the Grappling Hook. To use it, activate her Inventory and select the oddly shaped four-pointed star symbol.

In this image you can see the Grappling Hook at the ready on her right arm.

Use whatever key you have assigned to "Alternate Fire" to put the Grappling Hook in the "Toggle/Grapple" mode.

Now just aim with the crosshairs on any likely spot on the wall or ceiling and press "Primary Fire"

You can use to it travel horizontally as well as vertically. It can help you reach very high places, as well get down from them safely. There doesn't seem to be any limit on its range or on the number of times she can use it. No Jedi should be without one.